T2600G/L3/Gratuitous ARP

Gratuitous ARP is a special kind of ARP. For gratuitous ARP request packets, both the source and destination IP addresses are the sender's own. Ordinarily, no reply packet will be received by the sender. If a reply packet is received, it means that another host is using the same IP address.

Gratuitous ARP Global Settings

You can configure the global Gratuitous ARP parameters here.

Send on IP Interface Status Up: With this option enabled, the interface will send gratuitous ARP request packets when its status becomes up. This is used to announce the interface's IP address to the other hosts. It is enabled by default.

Send on Duplicate IP Detected: With this option enabled, the interface will send gratuitous ARP request packets when a gratuitous ARP request packet is received for which the IP address is the same as the interface's. In this case, the switch knows that another host is using the same IP address as its own. To claim the IP address for the correct owner, the interface sends gratuitous ARP packets. It is disabled by default.

Gratuitous ARP Learning: Normally, the switch only updates the MAC address table by learning from the ARP reply packet or normal ARP request packet. With this option enabled, the switch will also update the MAC address table by learning from the received gratuitous ARP packets. It is disabled by default.

Gratuitous ARP Periodical Send Interval

You can configure the interval of sending gratuitous ARP request packets for the layer 3 interface.

Interface ID: Specify the interface ID to send gratuitous ARP packets.

Interval Time: Enter the interval of sending gratuitous ARP request packets for the layer 3 interface. A value 0 means the interface will not send gratuitous ARP request packets periodically.

Gratuitous ARP Config

You can view and configure the interval of sending gratuitous ARP request packets for the interface.

Interface name: Displays the interface.

Gratuitous ARP Periodical Send Interval: Enter the interval of sending gratuitous ARP request packets for the interface. A value 0 means the interface will not send gratuitous ARP request packets periodically.